Self-clearing silencer for paper-making machines



W. E. STEWART SELF CLEARING-SILENCER FOR PAPER MAKING MACHINES Filed NOV. l8 1920 p I A 07 L M a A TTORNE V3 silencer.

machine.

Patented Dec, 16, 1924.

rna ssa unirao s'raresra'ranr orrica,

v wrnnnm E. STEWART, OF SOUTH GLENS FALLS, NEW YORK, ASSIGNOR 0F ONE-HALF 'IG THEODORE STOUGHTON, OF SOUTH GLENS FALLS, NEW YORK.

SELF-GLEARING SILENCER FGR PEER-MAKING macnmm.

- Application filed November 18, 1920. Serial Ito. 424,806.

To all whom it may concern:

Be it known that I, WILLIAM E. STEWART,

a citizen of the United States, and a resident I header box to the Wire belt on which the said stock is spread in the initial step of the sheet forming process; to secure an even speed of the stock to the said belt to prevent clogging of the stock or thickening of the same adjacent the delivery of the stock from the said box; and to simplify and cheapen the construction and installation of the said Drawings.

showing the direction of the How of the pulp bearing stock through header box and silencer.

' Description.

Heretofore, header boxes have been provided with some form of perforated or slotted partition disposed across the said box adjacent the delivery end thereof. This partition has been called a silencer box. The principal function thereof has been to quiet the uplow of the stock passing to the tail board or delivery member of the said box wherefrom the stock is floated onto the sheet-forming belt of the paper making 'llhese partitions or silencers have been subject to the dificulty that the pulp contained in the stock has tended to mat on the silencer to form small masses of partly attached pulp, which after a time have been carried through the silencer by the stream of stock rising through the same, and have passed in this matted condition onto the belt, and in the rocess of forming a sheet, marred or imperfect sections have been produced by the said matted masses. Means have been devised for preventing the clogging of the stock against the under-surface of the silencer. These means, however, have been inefiicient and faulty dependent, as they have done, on breaking up or scattering the masses referred to. The fault has arisen largely from the fact that preventive means has operated after, instead of prior to the formation of the matted masses, hence, it often occurs that the mass is either driven through the interstices of the silencer in part, or wholly form, thus defeating the purpose for which the clearing device was employed.

In the present invention a cylinder 8 is fixedly mounted on a shaft 9 which rotates in varying boxes 10 set in the sides of the I box 11 to form the last vertical passage in the said box.

The cylinder 8 is preferably made up of a number of short len%h cylinders, as at 8, which, as seenbest in igure 1 of the drawings, are disposw in service, end to end. By this arrangement the length of the cylinder 8 may be varied to suit various wldths of header boxes.

The shaft 9 is provided with a pulley 14 which, as seen best in Figure 2 of the drawings, is operatively connected by the belt 15, with a small pulley 16 on the drum 1?, over which the meshed wire belt 18 is driven. This arrangement provides for slowly rotating the cylinder 8. The cylinder 8 is pro vided with perforations 19 which are spaced apart to adapt the silencer to the work for which it is designed. The stock freely passes through the perforations 19 to the interior of the cylinder 8 and therefrom on the opposite side of the said cylinder. It will be seen that if the pulp is arrested and matted on the surface of the cylinder at the time when the stock is flowing into the said cylinder, the matted pulp is cleared from the cylinder as the stock flows from out thereof at the delivery side of the said cylinder. Due to the slow but constant revolution of the cylinder the stock is prevented extent for the reason that the time therefor is'not permitted in the operation of the cylinder, the receiving face passing constantly away from the receiving side of the said cylinder to the delivery side thereof. While in the accompanying drawings the cylinder 8 is shown as being constructed from sheet metal perforated, it will be underwithin the scope of the present claims. 15

stood that other forms of metal such as expanded metal, or wire cloth of suitable construction may be employed. This variation in the construction is considered as coming Ulain'zs. 1. In combination with a header box having'a delivery opening and a baflie plate adjacent thereto ,for forming a vertical narrowchannel leading to a perforated cylinder rotativ'ely mounted leading rotatingcylinder adapted for the passage of posed said delivery opening;

leading said delivery opening, and a silencer d sposed crossways of said channel and in close proximity to said delivery opening and in the path of the stock flowing. therethrough. j

3. In combination with a header box having a delivery opening and a bafiie plate adjacent thereto for forming avertical channel to said delivery opening, and a stock therethrough', said cylinder being dis-- cross'way's of said channel and in close proximity to said delivery opening and in the path of the stock flowing through said channel and opening. 4 y

WILLIAM E. STEWART. 

